2090381 has 2 divisors, whose sum is σ = 2090382. Its totient is φ = 2090380.

The previous prime is 2090357. The next prime is 2090441. The reversal of 2090381 is 1830902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 477481 = 1270^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 2090381 - 2⁶ = 2090317 is a prime.

It is a super-2 number, since 2×2090381² = 8739385450322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2090351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045190 + 1045191.

It is an arithmetic number, because the mean of its divisors is an integer number (1045191).

2^2090381 is an apocalyptic number.

It is an amenable number.

2090381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2090381 is an equidigital number, since it uses as much as digits as its factorization.

2090381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2090381 is about 1445.8149950806. The cubic root of 2090381 is about 127.8620951295.

The spelling of 2090381 in words is "two million, ninety thousand, three hundred eighty-one".